Saha has been among the most consistent performers at Everton this season.
Moyes said: "I don't think he's got anything to prove to United. I think everybody at Manchester United would probably admit that Louis Saha was a match for any player there with the talent and ability he's got. I'm still relatively young but he's certainly in the top two maybe three players I've worked with. He's got some unbelievable ability as a football player, incredible."